Experimental Research On Post-fire Performance Of Prefabricated Concrete Frame Structure Beam-column Exterior Joints

Prefabricated concrete frame structure has been actively promoted by government departments for the advantages of high efficiency,environmental protection,convenience,and sustainable development,etc.Just as cast-in-situ concrete frame strcture beam-column joints,the structural safety is guaranteed by prefabricated concrete frame structure beam-column joints,which is the key part of structure,especially in fire.Nowadays,there is little research on post-fire performance of prefabricated concrete frame structure beam-column joints.prefabricated concrete frame structure beam-column exterior joints were carried out to study post-fire performance in this paper.The mian research work includes:1.Experiment were carried on two prefabricated concrete frame structure beam-column exterior joints and one cast-in-situ concrete frame structure beam-column exterior joints.The temperature of different place,deformations,failure modes and post–fire performance of different fire duration time and different type of joints were analyzd by using the data obtained in the experiment.2.Material properties in different phase were dertermined by using the subroutine.The finite element analysis model of prefabricated concrete frame structure beam-column exterior joints and cast-in-situ concrete frame structure beam-column exterior joints were established by ABAQUS to analyze the post-fire performance of two different type joints.These models were verified by the results of experiments and they agree well with each other.3.Temperature distributions,deformations of beam end,failure modes and post-fire performance were analyzed by the finite element analysis models and fire duration time(t)、load ratio of beam(n)、steel ratio of beam(ρ)were considered to study how they influence deformations in cooling pharse and post-fire performance of joints.